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拖动条改变图片的透明度

xml

资源方面，SeeKBar的thumb时拖动条按钮的样式，

activity：

import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.widget.ImageView;import android.widget.SeekBar;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                final ImageView image =(ImageView)findViewById(R.id.image);        SeekBar seekbar = (SeekBar)findViewById(R.id.seelbar);                seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {                        @Override            public void onStopTrackingTouch(SeekBar seekBar) {                // TODO Auto-generated method stub                            }                        @Override            public void onStartTrackingTouch(SeekBar seekBar) {                // TODO Auto-generated method stub                            }                        @Override            public void onProgressChanged(SeekBar seekBar, int progress,                    boolean fromUser) {                // TODO Auto-generated method stub                image.setAlpha(progress);            }        });                    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}